Auxiliary governor.



No. 63!,778. Patented Aug. 29, I899. W. E; DEAN.

AUXILIARY GOVERNOR.

(Application filed Apr. 26, 1899.: (Nb Modal.) 3 Sheets Sheet I.

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\VALLAOE E. DEAN, OF HUNTSVILLE, ALABAMA.

AUXILIARY GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 631,778, dated August 29, 1899. Application filed April 26, 1899- Serial No.714,564. (N0 model.)

To (all whom it may concern.-

Be it known that I,WALLAOE E. DEAN,a citizen of the United States, residing at Huntsville, in the county of Madison and State of Alabama, have invented certain new and useful Improvements in Auxiliary Governors; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to auxiliary governors for steam-engines; and the object is to provide a simple and effective device for automatically controlling the engine con formably to its Working load through the medium of the main governor.

To this end the invention consists in the construction, combination, and arrangement of the several parts of the device, as will be hereinafter more fully described,and particularly pointed out in the claims.

In the accompanying drawings the same reference characters indicate the same parts of the invention. A I

Figure 1 is a side elevation of my improved auxiliary governor. Fig. 2 is a top plan view of the same. Fig. 3 is a transverse section on the line 3 3 of Fig. 1. Fig. 4 is a modified form showing a spring in place of the counterbalance-weight.

Heretofore in operating ball-governors as commonly made the centrifugal force was relied upon wholly to control the time of cutoff or the amount of steam admitted, and this was more or less unreliable when there were great varieties in the duty or the load on the engine. The governor-balls are sensitive to slight intermittent differences, but if half of the load (more or less) should be taken off the speed will be accelerated two per cent., (more or less,) which would be too fast'for the remaining load, and the governors will not adjust themselves to the former speed from the fact that it requires less steam. To accomplish this change, it requires an accelerated speed for the governor to adjust itself,

and thesame is true if the steam-pressure should be increased, and vice versa, from which defects it follows that the engine will not remain at a uniform speed if the load or steam-pressure is materially varied. This objection is overcome by the use of a leverrod and the other is a sliding weight or spring,

which normally counterbalances the main governor-operating mechanism. So far as I am aware this counterbalancing weight 'or spring has heretofore been adjusted by hand.

To overcome this objection, I have provided an auxiliary governor whereby this weight is automatically adjusted more quickly and accurately by the mechanism which I will now proceed to describe.

1 denotes the main or engine governor stand; 2, the lever coacting therewith, as above stated; 3, the cut-off lever, and 4 the counterbalancing-weight, which has a sliding engagement with the lever 2. The levers 2 and 3 are fixed on a counter-shaft 2, which also carries a yoke-lever 2 engaging the sleeve 3, which has a sliding engagement with the governor-stand 1, as shown in Fig. 2.

5 denotes a lateral stud on the weight, on which ispivoted the swiveled threaded socket 6 to. receive the threaded end of the rod 7, adjustably secured therein by the usual jamnut. The opposite end of the rod carries a similar socket 6, which is pivoted to a rackbar 8, having a reciprocating engagement posite end is pivoted to the vertical lever 13,

fulcrumed in the bracket 14, fixed to the bedplate 10, and its upper end is pivoted to the adjustable eccentric-rod 15, secured to the eccentric-strap 16, encompassing the eccentric 17, fixed on the counter-shaft 18, provided with a band-pulley 19, by means of thereon by the join-nut 23 and which receives the free end of a lever 24, fixed on a rockshaft 25, journaled in bearing-boxes 26, fixed to the bed-plate.

27 denotesavertical leverfixed on the rockshaft 25, and its upper end is pivoted to a horizontal bar 28, its opposite end being pivoted to acorresponding parallel lever 27, fulcrumed in the bracket 26, fixed to the bedplate. The lower ends of these levers 27 27 are each provided with a counterbalancing- Weight 29 to equalize their movement, and the horizontal bar 28, which extends parallel with and contiguous to the rack-bar '8, is formed with a recess 30 in its upper edge.

31 and 32 denote gravity-pawls fulcrumed on the horizontal bar 12, and the free end of each pawl terminates in a tooth 33, which extends across the path of the rack-bar 8 and horizontal bar 28, the teeth normally resting on the plane edge of the horizontal bar 28 and on each side of the recess 30, and consequently out of contact with the teeth on the I rack-bar 8.

The operation of the device is as follows: \Vhen the main and auxiliary governors are rotating at their normal speed, the weight 4 is adjusted on the lever 2 to conform to the normal load on the engine, and the horizontal bar 28 is so adjusted that the pawls 31 and 32 will travel on the plane edge of the bar 28 on their respective sides of the recess 30 without droppinginto it or coming in contact with the teeth on the rack-bar 8, which is connected to the weight 4. If now the load on the engine is increased, the auxiliary-gov ernor shaft 2l'raises and, through the medium of the arm 24 and lever 27, moves the horizontal bar 28 to the right, which permits the pawl 32 to drop in the recess 30 and engage one of the teeth on the rack-bar and move it to the left. As the pawl 32 and bar 28 move forward this slides the weight 4 outwardly on the lever 2, thus enabling the engine-governor to increase the length of travel of the cut-off valve, and vice versa. If the load on the engine should be decreased, the auxiliary-governor shaft will move downward and move the bar 8 connected thereto, so as to increase or diminish the tension of the spring exerted on the lever 2 to correspond toany variations in the load on the engine.

The advantages of an automatic device of this character will be more fully appreciated when it is stated that the counterbalance-' weight 4 has heretofore been manipulated entirely by hand.

In Fig. 4 I have shown the weight 4 supplanted by a coiled spring, one end of which is fixed to the lever 2 and the other to a bellcrank lever, which in turn is con nected'to the rack-bar 8, so that a movement of the latter to the right will lessen the tension of the spring, and consequently the weight on the lever 2, and vice versa a reverse effect will be produced when the rack-bar is moved to the left.

The accompanying drawings show my invention in the best form now known to me; but many changes might be made within the skill of a good mechanic without departing from the spirit of my invention as set forth in the claims at the end of this specification.

Having thus fully described my invention,

what I claim as new and useful, and desire to secure by Letters Patent of the United States,

1. In combination, a main governor provided with an adjustable weight adapted to counterbalance the centrifugal effect of said governor, an auxiliary or independent governor and intermediate means whereby the centrifugal force of the said auxiliary or independent governor will be communicated to the weight on said main governor, substantially as and for the purpose set forth.

2. A steam-engine governor, and its counterbalance, in combination with an auxiliary governor, operatively connected to said counterbalance, substantially as and for the purpose set forth.

3. An engine-governor provided with a counterbalance-weight 4, in combination with the auxiliary governor 20,'and its shaft 21, the crank-arm 24, and the parallel levers 27 27 connected by the recessed bar 28, the rackbar 8 connected to said weight 4, the shaft 18 eccentric, strap and their rod, the lever 13, pivoted to said lever 18, the horizontal bar 12, carried by said lever 13, and the gravity-pawls 31 32 fulcrumed on said bar 12, and projecting'into the path of the bars 12 and 28, substantially as and for the purpose set forth.

In testimony whereof- I have hereunto set my hand in presence of two subscribing witnesses.

\VALLAOE E. DEAN.

\Vitnesses:

CHAS. S. MOCALLEY, TANCRED Bn'r'rs. 

